Dental disk-holder



(No, Model.)

G. W. WATS-0N. DENTAL DISK HOLDER.

No. 596,254. Patented Dec. 28, 1897.

' INVENTOR:

By his Aftarney M M.

WITNESSES:

momma WASHINGI'ON n c UNITED STATES PATENT OFFICE. o

GEORGE W'ALLAOE WATSON, OF PASSAIO, NEW JERSEY.

DENTAL DISK-HOLDER.

SPECIFICATION forming part of Letters Patent No. 596,254, dated December28, 1897. Application filed A gust 3, 1897. Serial No. 646,921. (Nomodel.)

To all whom it may concern.-

Be it known that I, GEORGE WALLACE WAT- SON, a citizen of the UnitedStates, residing at the city of Passaic, in the county of Passaic andState of New Jersey, have invented certain new and useful Improvementsin Dental Disk-Holders and I do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

My invention relates to improvements in means for securing disks orother polishing and abrading instruments upon their mandrels; anditsobject is to provide an improved mandrel or holder which shall besimple, cheap, and effective, and by means of which the disk or otherinstrument may be quickly and securely attached and held in place andyet be easily and quickly removed and replaced when desired.

The invention consists in the novel construction and combination ofparts hereinafter fully described and claimed.

I attain these objects by the mechanism illustrated in the accompanyingdrawings, in which Figure 1 is a side elevation, partly in section, of amandrel with the disk connected therewith in accordance with myinvention. Fig. 2 is a side view of the pin removed from the mandrel.Fig. 3 is a view of a mandrel with the disk and pin removed. Fig. a isan end view of the mandrel with the plate removed. Fig. 5 is a view ofthe plate. Fig. 6 is an end view of the mandrel with the plate inposition, but without the pin. Fig. 7 is a View of the under side of thepin. Fig. 8 is a view of the spring.

Similar letters refer to similar parts throughout the several views.

In the accompanying drawings, a represents a dental mandrel, which maybe attached to a dental engine in the usual manner, having a plate I)fitted into its outer and larger end and retained in place by anysuitable means. This plate 19 has an opening, preferably of circularform, in its face. A spring 0, which is preferably of flat spiral form,is placed beneath the plate I? in such a manner that a free end extendsor projects upon the opening in the plate I). The spring may be held inplace by the plate b and by the outward pressure of itself against thewalls of the mandrel or by any other suitable means. Two or moreprojections e e extend outward from the face of the plate I) and arereceived within the hollow head of the pin d when the pin is insertedwithin the mandrel a.

To attach a dental disk or other abrading instrument to a mandrelcontaining my invention, the pin d is removed from the mandrel a. Thepin dis then inserted in the center of the disk f, which, as ordinarilysupplied to the trade, has an opening in the center to receive it. Thepin d is then inserted in the opening in the face of the plate I) andpressed down between the free end of the spring 0 and the sides of theopening in the plate I) and of the mandrel. The projections e e will beforced through the disk f and will enter the hollow head of the pin (1.The disk will then be firmly held in place, and the pin will beprevented from slipping or falling out by the pressure upon it of thespring 0 and the resisting side Walls of the plate and mandrel.

What I claim as my invention, and desire to secure by Letters Patent,is-

In a dental disk holder or carrier, the com bination of a mandrel, a pinhaving an enlarged head or cap, and a spring, within the mandrel, in aplane at right angles to the mandrel-shaft, and with a free endprojecting across an opening in the plate to press against the pin,substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

G. WVALLACE WATSON.

